Means for drawing material



y 1952 M. s. SCHNELL. 2,662,411

MEANS FOR DRAWING MATERIAL Filed Aug. 2, 1949 3 Sheets-Sheet 1 INVENTOR.MBQHAEL. SQ QHNELL Y 8, 1952 M. s. SCHNELL 2,2,4H

MEANS FOR DRAWING MATERIAL Filed Aug. 2, 1949 5 Sheets-Sheet 2 25INVENTOR.

MICHAEL S.SCHNELL.

BYZ/MMM A TTORN' y 9 1952 M. s. SCHNELL awmm MEANS FOR DRAWING MATERIALFiled Aug. 2, 1949 s Sheets-Sheet s INVENTOR. MlCHAEL S.5c|- \NELL ATTORNE Y Patented July 8, 19 52 ENT :oF FicE j jMEANsFonnRAwI G MATERIAL1 MichaLlSQSchfill, 'SaIemQOhi'o Application August 2, 1949,Seriatl'Noj-108L09T My invention-relates '-to means for drawin materialsuch, "for example, sheet metal, and

thfe princ'ipal object of myhnvention is to-provide new and improvedmeansof this character.

: FHeretofOre, in order to efiect'a substantial reduction the diameter fan article, it was v necssarytosiibject the article to more than onewith the great skill and accilr'acy heretofore r e-v quiresm producingthe prior art dies and in setting up the die "and a pressior "a'drawingoperation; Mariyother advantages; not herein particular-1y pointe'd oit, will appear or be'obnous tothose skilled inthe a-rt'.

In the drawings accompanying "this "specification and forminga part ":of.thisi application, there is "shown, for -*purposes of illustration, an

embodiment which my' inventi'on may assume,

and in these df'awing'S:

Figure l is a longitudir'ial'sec'tional view through a draw dieillustrating an embodiment of my invention:

fgflre -2 isa plan view of a blank shown in section in 'r'igure 1, but"drawn to a slightly smaller-sca e, r I Fi'g'iir'efi' is seamen-a1viewsimilar to-Figure '1, lint with parts differentf'position, V fFigure4 is a perspective view dfa partially 'rmedfe e I l Figureh is "a,"sectional ew similar to" Figures 1 and 2 but with p arts'indifferenvpo'sition, and Figure 6'is a perspective view of a shellresulting from one operation of the die herein disclosed. Referr-ing tothe drawings the embodiment herein shown to disclose the inventioncomprises a die body 10 which isherefshown in the form of a tubular bodyproviding a cylindrical die cavity H. The die body ['0 has a top flangel2 formed with agenerallyplaneiupper surface l3, the latter merging withthe 'adjacent surface of the die cavityin a roundedvdrawing edge [4. The

t-e body yhereinshownalsoxhas a bottom flange fI S secured, asbymeansofibolt's I6, to, arshoe or plate n, and the latter adaptedto be2 Claims. (01. 113 46) secured to the bolster-plate |"8'-'or"simi 1arsurface shoe H. v

of a suitablepres's (not shown).

Disposed within'the die-cavity I l l and extending upwardly-from theshoe 1"! punch 19 which is here shown as' in the formof a "cylindricalprojection formed 'with 'ashouldered'aperture 20 for the reception 'of-a -'bo1-t 2l which is threaded into theshoe l1. I if Theuppersurfacefofthe punch I9,""a's'herein disclosed, is positioned some :distanbe heldwthe opening into the 'die'cavity 'H, c surface may be'curve'd'and'a plug2 ably fitted into the aperture n the has an Out8r'surfabe f0imi1ig faContinuation "(if the upper surface' ofthe plug l9,

The diameter of the plug [9 is less tha nfthe diameter of the die cavity'l lfto i'orm-an'aiinular ring-like'space'23 therebetween. A strippernn2'4 isslidable -aX ia11y Witliin the space 23, and pins 25are;resilientlyfpresse'd(by-rubber cushion or pneumatic pressure)againstthe'strippefrhig 2'4 and "ilrgeit in a direction away'f'r'oin'the sleeve-means'z's is adaptd'fOl'codpilt with the die cavity11 and'thepunch I9 'a'nd in'the embodiment "herein disclosed, such{means tem prises a sleeve 2Tsgectire'd, as byineans'o fbolts 28, to ahead jz'e' which adaptd'to b se'cured to a mov'abl'e portion of thepress, such as to therar'n an,

The sleeve '21, as here shown, is in the term of a cylinder, havingouter and inner wausurfaces 3| and 32 respectively. The free end of thesleeve 27, in the embodiment disclosed; lies in a plane 'norm'al to theaxis of "thefsleev'e, and has rounded outer and inner drawing edgesr asand 34 respectively. a

A blank holder 35 is tbrmed with anape'rt'ure 36 to permit the sleeve-21 to -work therethrtju'gh, and as here shown,'has aidwergenerauyqpiane surface 31 cooperable with 'the'su'face 13 'ofthe upperflange l-2ft'o 'ciamp'a blank 38 therehtw'een.

As swell known i'nfthe art, the mask holder 3 5; presses the peripheralportion of the blank 38 to the surfac'e f3 throiighjaction of "suitablemeans (notshown) tenet-smear drawing of the blank 38 may be 'efiected.vj V As best seen in figures, theouter wen "senses of the Sleeve 21 hasproper operating clearance withthe die cavity I'Land as bestseeninFi'gure '5 the inner wall surface of the 'slee'vefll' h'as properoperating clearance with the punch 'l9.

In operation, andassuining that the sleeve '2] has been withdrawnfrom,-the diecavity lnl as shown-in Figure -1, a blank-38 is positionedon drawn to a cup-shaped article as best shown at 40 in Figures 3 and4.

During this operation considerable heat is generated in the blank andtherefore the metal is,

made more pliable than it is in cold condition.

Further, during this drawing operation, the metal is caused to flow fromflat shape to the drawn shape.

The sleeve 21 continues its descent and carries the cup-shape article 40with it, and shortly after the blank has been drawn to. cup-shape, andbefore the metal has lost its heat from the drawing operation justdescribed, and before the metal has taken a set, the sleeve 21 pressesthe cupshaped article over the punch l9.

Figure 3shows the position of the sleeve-21 just before the cup-shapedarticle is pressed over the punch 19. As the sleeve 21 continues itsdescent, the bottom 40a of the cup-shaped article is pressed against theupper surface of the punch l9, and the article commences to turninside-out and is drawn over the drawing edge 34 and the upper surfaceof the punch, and finally assumes the shape of the shellshown at M inFigures 5 and 6.

Figure 5 shows the free end of the sleeve clear of the open end of theshell 4| and pressing the stripper ring 24 downwardly against theresilient upward force supplied by the pins 25. With theoperationcompleted, the travel of the ram 39 isreversed to withdraw thesleeve '21 from the die cavity ll. As the sleeve 2! is withdrawn,

the stripper ring 24 presses against the lower end of the shell tends tostrip the shell from the punch [9. The stripper ring 24 may havesufficient travel to substantially completely remove the shell 41 fromthe punch l9, or it may dislodge the shell and other suitable ejectormeans (not shown) may be provided to completely remove the shell 4| fromthe punch l9 and position it so that it may be readily removed from thedie cavity ll. i

It is here pointed out that the invention herein disclosed may be usedwith equal utility to produce either large or small diameter articles ofeither thin or thick gauge. Articles of considerable size and materialthickness have been formed from blank shape to desired shape in onestroke of the press at a very satisfactory production rate per hour. 1

As an example, on one particular job, a shell 4% inches inside diameterby 7 inches deep and .125 inch wall thickness has been formed from ablank 12% inches in diameter. This job showed a total draw reduction ofabout 62 to 63% with a reduction of metal thickness of substantially 8to 9%. Since previous methods required more than one die because it washeretofore not practical to secure so great a draw reduction, it will beappreciated that considerable economy in production, handling and toolcost is efiected, and annealing between intermediate operations iseliminated.

The foregoing example is by no means an indication of the limitation ofthe invention, since: shells of greater diameter, depth and wall thick--ness have been equally well producedv in one operation on draw dies ofmy invention.

In view of the foregoing, it will be apparent to those skilled in theart that I have accomplished at least the principal object of myinvention, and it also will be apparent to those skilled in the art thatthe embodiment herein described may be-variously changed and modified,without departing from the spirit of the invention, and

that the invention is capable of uses and has advantages not hereinspecifically described; hence'it will be appreciated that the hereindisclosed embodiment is illustrative only, and that my invention isnotlimited thereto.

I claim:

1. A drawing die adapted for use with a standard press having stationaryand movable parts, comprising a first unit including a die body and adie post, said body and post being held in axial alignment and againstrelative movement, and a second unit comprising a sleeve, said unitsbeing adapted for respective mounting on the base and ram members ofsaid press so as to be movable toward and away from each other, said diebody having a cavity for-receiving said sleeve,

said. .cavityand said sleeve :having cooperable drawing surfaces so thata; blank. positioned therebetween is drawn into .a cup-shaped shell byrelative movement of said units to position said sleeve within saidcavity, said sleeve having a recess for receiving said post, said sleeveand said post having cooperable interior andexterior drawing surfaces sothatsaid shell is inverted and drawn into a reduced cup-shaped shell byrelative movement of said units to position said post within saidsleeve. r

2. A drawing die for use with a standard press comprising a stationarydie body having a cavity, a stationary post disposed co-axiallywithinsaid cavity and held against relative movement with said diebody,and a sleeve disposed co-axial with said cavity, said die body and saidpost being carried by the base of said press and said sleeve beingcarried bythe movable platen of said press and movable into said diecavity to engage and deform. a blank positioned therebetween into acup-shaped: shell having a closed end spanning the end of said sleeveand a skirt wall disposed around the exterior surface of said sleeve,said sleeve being movable over said post so that the closed end of saidshell is pushed inwardly of said sleeve by the terminal end of saidpost, said sleeve and said post having cooperating interior and exteriordrawing surfaces for turning said shell inside-out into a reducedcup-shaped shell having its closed end spanning said post terminal endand a skirt wall disposed between adjoining interior and exteriorsurfaces of said sleeve and said post.

- MICHAEL S. SCHNELL.

REFERENCES CITED The following references are of record in the file ofthis patent: I

UNITED STATES PATENTS Number Name Date 483,008 Norton Sept. 20, 1892516,809 Hewitt et a1. Mar. 20, 1894 1,649,841 May Nov. 22, 19271,879,510 Rode" Sept. 27, 1932 2,132,002 Hight ,Oct. 4, 1938 2,331,490Menkin Oct. '12, 1943

